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X-TMASE-XGENCLOUD: de2b7c53-f4c5-47d0-a937-a47532ae048e-0-0-200-0 Archived-At: Subject: [IPFIX] count of EHs (RE: Some comments on draft-ietf-opsawg-ipfix-tcpo-v6eh X-BeenThere: ipfix@ietf.org X-Mailman-Version: 2.1.39 Precedence: list List-Id: IPFIX WG discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Oct 2023 12:16:08 -0000 --_000_AS8PR02MB10146DD067CECA002CE9BCCF188CEAAS8PR02MB10146eu_ Content-Type: text/plain; charset="iso-8859-1" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Re-, Focusing on this part of your comments: =3D=3D About having counters per extension header how is "This Information Element= echoes the order and number of occurrences" to be interpreted for the foll= owing flow? HBH-RH-DST HBH-DST-RH-FRA0-DST HBH-DST-RH-FRA1-... RH-DST Will it be a single IE with HBH=3D3, DST=3D5, RH=3D3, FRA0=3D1, FRA1=3D1 or= 4 IE exported (one for each chain) ? I think that the 4 IE sounds more logical and useful, then there is no need= to count the occurrences of one specific EH but more how often a specific = EH chain was seen. =3D=3D Yes, I confirm that 4 IEs will be exported. The count is still needed to report cases where an EH appear multiple times= in the same chain. Updated the text to insist the count is related to cons= ecutive occurrences, though: OLD: Description: As per [RFC8200], IPv6 nodes must accept and attempt to process extension headers in occurring any number of times in the same packet. This Information Element echoes the order and number of occurrences of the same extension header instance in an IPv6 packet. NEW: Description: As per Section 4.1 of [RFC8200], IPv6 nodes must accept and attempt to process extension headers in occurring any number of times in the same packet. This Information Element echoes the order of extension headers and number of consecutive occurrences of the same extension header type in an IPv6 packet. The same extension header type may appear several times in an ipv6ExtensionHeaderCount Information Element (see Section 4.1 of [RFC8200]. For example, if an IPv6 packet includes a Hop-by-Hop Options header, a Destination Options header, a Fragment header, and Destination Options header, the ipv6ExtensionHeaderCount Information Element will report two counts of the Destination Options header: the occurrences that are observed before the Fragment header and the occurrences right after the Fragment header. Cheers, Med De : OPSAWG De la part de Eric Vyncke (evyncke) Envoy=E9 : vendredi 6 octobre 2023 14:49 =C0 : opsawg@ietf.org Cc : ipfix@ietf.org Objet : [OPSAWG] Some comments on draft-ietf-opsawg-ipfix-tcpo-v6eh Beno=EEt and Med, Thanks for this useful document, please find below some comments (obviously= without any hat). Should the "No Next-Header" (next-header=3D59) be included (cfr my other re= marks on the companion I-D) ? There should be a way to convey the information that the exporter was (un)a= ble to parse the *full* extension header chain due to HW limitation. This c= ould be done by adding a bit/counter "KNOWN" (the opposite of UNKNOWN in th= e sense of a known layer-4 header). About having counters per extension header how is "This Information Element= echoes the order and number of occurrences" to be interpreted for the foll= owing flow? HBH-RH-DST HBH-DST-RH-FRA0-DST HBH-DST-RH-FRA1-... RH-DST Will it be a single IE with HBH=3D3, DST=3D5, RH=3D3, FRA0=3D1, FRA1=3D1 or= 4 IE exported (one for each chain) ? I think that the 4 IE sounds more logical and useful, then there is no need= to count the occurrences of one specific EH but more how often a specific = EH chain was seen. I still wonder why the tcpOptions and ipv6ExtensionHeaders are in the same = I-D though ;-) Hope this helps, -=E9ric ___________________________________________________________________________= _________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_AS8PR02MB10146DD067CECA002CE9BCCF188CEAAS8PR02MB10146eu_ Content-Type: text/html; charset="iso-8859-1" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable

= Re-,

=  

Focusing on this part of your comments:

 

=3D=3D

About having counters per exten= sion header how is “This Information Element echoes the order and num= ber of occurrences” to be interpreted for the following flow?

 

HBH-RH-DST

HBH-DST-RH-FRA0-DST<= /span>

HBH-DST-RH-FRA1-...<= /span>

RH-DST

 

Will it be a single IE with HBH= =3D3, DST=3D5, RH=3D3, FRA0=3D1, FRA1=3D1 or 4 IE exported (one for each ch= ain) ?

 

I think that the 4 IE sounds mo= re logical and useful, then there is no need to count the occurrences of on= e specific EH but more how often a specific EH chain was seen.

= =3D=3D

=  

Yes, I confirm that 4 IEs will be exported.

 

The count is still needed to report cases where an EH appear= multiple times in the same chain. Updated the text to insist the count is = related to consecutive occurrences, though:

 

OLD:

   Description:  As per [RFC8200], IPv6 = nodes must accept and attempt to

      process extension headers in = occurring any number of times in the

      same packet.  This Infor= mation Element echoes the order and number

      of occurrences of the same ex= tension header instance in an IPv6

      packet.

 

NEW:

   Description:&n=
bsp; As per Section 4.1 of [RFC8200], IPv6 nodes must accept
    &nb=
sp; and attempt to process extension headers in occurring any number
    &nb=
sp; of times in the same packet.  This Information Element echoes the<=
o:p>
    &nb=
sp; order of extension headers and number of consecutive occurrences
    &nb=
sp; of the same extension header type in an IPv6 packet.<=
/pre>

 

    &nb=
sp; The same extension header type may appear several times in an


    &nb=
sp; ipv6ExtensionHeaderCount Information Element (see Section 4.1 of


    &nb=
sp; [RFC8200].  For example, if an IPv6 packet includes a Hop-by-Hop


    &nb=
sp; Options header, a Destination Options header, a Fragment header,


    &nb=
sp; and Destination Options header, the ipv6ExtensionHeaderCount=



    &nb=
sp; Information Element will report two counts of the Destination


    &nb=
sp; Options header: the occurrences that are observed before the=



    &nb=
sp; Fragment header and the occurrences right after the Fragment=



    &nb=
sp; header.


 


Cheers,


Med


 








De : OPSAWG <opsawg-bounces@ietf.org>
De la part de Eric Vyncke (evyncke)

Envoy=E9 : vendredi 6 octobre 2023 14:49

=C0 : opsawg@ietf.org

Cc : ipfix@ietf.org

Objet : [OPSAWG] Some comments on draft-ietf-opsawg-ipfix-tcpo-=
v6eh






 


Beno=EEt and Med,


 


Thanks for this useful document=
, please find below some comments (obviously without any hat).


 


Should the “No Next-Heade=
r” (next-header=3D59) be included (cfr my other remarks on the compan=
ion I-D) ?


 


There should be a way to convey=
 the information that the exporter was (un)able to parse the *full* =
extension header chain due to HW limitation. This could be done by adding a=
 bit/counter “KNOWN” (the opposite of
 UNKNOWN in the sense of a known layer-4 header).


 


About having counters per exten=
sion header how is “This Information Element echoes the order and num=
ber of occurrences” to be interpreted for the following flow?


 


HBH-RH-DST


HBH-DST-RH-FRA0-DST<=
/span>


HBH-DST-RH-FRA1-...<=
/span>


RH-DST


 


Will it be a single IE with HBH=
=3D3, DST=3D5, RH=3D3, FRA0=3D1, FRA1=3D1 or 4 IE exported (one for each ch=
ain) ?


 


I think that the 4 IE sounds mo=
re logical and useful, then there is no need to count the occurrences of on=
e specific EH but more how often a specific EH chain was seen.


 


I still wonder why the tcpOptio=
ns and ipv6ExtensionHeaders are in the same I-D though ;-)


 


Hope this helps,


 


-=E9ric


 




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 ce message par erreur, veuillez le signaler
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Orange decline toute responsabilite si ce message a ete altere, deforme ou =
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This message and its attachments may contain confidential or privileged inf=
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